 /* 添加样式，使弹窗居中显示 */
 #ranking-box {
  width: 600px;
  height: 700px;
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;
  border: 1px solid #ccc;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
  z-index: 999;
}

.content .ranking-content-item {
  width: 600px;
  margin: 10px auto;
  display: flex;
  justify-content: center;
} 

.btns button{
  margin-left: 30px;
  line-height: 32px;
}

table {
  border-collapse: collapse;
  width: 90%;
  margin-top: 20px;
}
th, td {
  border: 1px solid #dddddd;
  text-align: left;
  padding: 8px;
}
th {
  background-color: #f2f2f2;
}